The apparent stability constants of trace elements (Pb,Cd) with chloride and sulphate complexes in KNO3 solution are determined by ASV method.The concentration of trace metals in the solution is approximately 10-7—10-8M.The constants of lead and cadmium complexes with chloride or sulphate are calculated according to the shift of peak potential (Ep) with the metals stripping current maximum using the equation of Lingane.The constants listed above are in good agreement with some of literature values. The distribution of lead and cadmium speciation in sea water at C1‰=19, pH=8 is also calculated.
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